Prima, Dhany (2022) VARIASI SUHU DAN WAKTU SINTERING TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO BAJA ODS SS316L-Y2O3. S1 thesis, UNIVERSITAS SULTAN AGENG TIRTAYASA.
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Abstract
Steel is a material that is close to everyday life, as well as industrial needs. Until now steel is still being researched because steel has strength and good formability. Stainless steel or commonly known as Stainless Steel (SS) has characteristics that are able to have corrosion resistance apart from mechanical properties. The mechanical properties of steel itself are quite diverse and are influenced by the route of manufacture. One of the strengthening methods for stainless steel is to use the oxide dispersion method. Oxide Dispersion Strengthening (ODS) is a method in which atoms are inserted from oxide materials such as Yttria (Y2O3) through powder metallurgy method. This powder metallurgical process is known as the bottom-up method, in which the basic ingredients of the powder are synthesized, compacted to make it solid and sintered to have a chemical bond between the powders. The manufacturing procedure in this study uses an alloy of SS316L- Y2O3 with Y2O3 of 0,5% by weight, a High Energy Milling (HEM) process is carried out for 30 hours with a Ball to Powder Ratio (BPR) 10:1, the milled powder is then compacted with a load 20 tons produced green pellets where observations were made using an optical microscope, then the sintering process was carried out using the conventional furnace method with time parameters of 4 hours, 5 hours and 6 hours and temperature parameters using 600oC, 750oC, and 850oC. After that, both the powder and the results from the sintering process were subjected to XRD testing, and for the sintering results, observations were also made using an optical microscope, then the samples were observed by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray (EDX) was performed to determine the distribution of Y2O3. Based on XRD testing, it was found that the sample had ferrite and austenite peaks. Observations with an optical microscope were also carried out to observe the phase of the microstructure by etching process using V2A etchant in order to observe the difference between the austenite and ferrite phases. Then the hardness test was carried out on the sintered results of the sample. The cross-sectional hardness values obtained on SS600-4H, SS750-4H, SS850-4H, SS850-5H, SS850-6H are 146,3 HV, 108,79 HV, 398,63 HV, 91,18 HV, and 84,55 HV. The SS850-4H has a ferrite phase of 67,28%. Hardness decreases at lower temperature parameters because it still forms pores and the addition of holding time will decrease the hardness due to re-formed pores.
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | Baja merupakan material yang dekat dengan kehidupan sehari-hari, maupun keperluan dari industri. Sampai saat ini baja masih terus dilakukan penelitian karena baja pada dasarnya sudah memiliki kekuatan dan mampu bentuk yang baik. Baja tahan karat atau biasa dikenal dengan Stainless Steel (SS) memiliki karakteristik yang mampu memiliki ketahanan korosi selain dari sifat mekanik. Sifat mekanik dari baja sendiri ini cukup beragam dan dipengaruhi dari route pembuatannya. Salah satu metode penguatan untuk baja tahan karat adalah menggunakan metode dispersi oksida. Metode penguatan dispersi oksida atau Oxide Dispersion Strengthening (ODS) adalah metode dimana menyisipkan atom dari material oksida seperti Yttria (Y2O3) melalui metode metalurgi serbuk. Proses metalurgi serbuk ini disebut dengan metode bottom-up, dimana dilakukan sintesis dari bahan dasar serbuk, yang dilakukan kompaksi supaya padat dan dilakukan proses sintering supaya memiliki ikatan secara kimia antara serbuk tersebut. Prosedur pembuatan pada penelitian ini menggunakan paduan SS316L-Y2O3 dengan Y2O3 sebesar 0,5% berat dilakukan proses High Energy Milling (HEM) selama 30 jam dengan Ball to Powder Ratio (BPR) 10:1, serbuk hasil milling kemudian dilakukan proses kompaksi dengan beban 20 ton menghasilkan green pellet dimana dilakukan pengamatan menggunakan mikroskop optik, kemudian dilakukan proses sintering menggunakan metode conventional furnace dengan parameter waktu 4 jam, 5 jam dan 6 jam dan parameter suhu menggunakan 600oC, 750oC, dan 850oC. Setelah itu baik serbuk maupun hasil dari proses sintering dilakukan pengujian XRD, dan untuk hasil sintering juga dilakukan pengamatan menggunakan mikroskop optik, kemudian sampel dilakukan pengamatan Scanning Electron Microscope (SEM) dan dilakukan Energy Dispersive X-ray (EDX) untuk mengetahui persebaran dari Y2O3. Berdasarkan pengujian XRD didapatkan bahwa sampel memiliki puncak ferit dan austenit. Pengamatan dengan mikroskop optik juga kembali dilakukan untuk pengamatan fasa dari struktur mikro dengan proses etsa menggunakan V2A etchant supaya dapat diamati perbedaan antara fasa austenit dan ferit. kemudian dilakukan pengujian kekerasan pada hasil sintering dari sampel. Nilai kekerasan cross-section yang didapatkan pada SS600-4H, SS750-4H, SS850- 4H, SS850-5H, SS850-6H adalah 146,3 HV, 108,79 HV, 398,63 HV, 91,18 HV, dan 84,55 HV. Pada SS850-4H memiliki fasa ferit sebesar 67,28%. Kekerasan menurun pada parameter suhu yang lebih rendah karena masih membentuk pori dan penambahan waktu tahan akan menurunkan kekerasan akibat dari pori yang kembali terbentuk. | |||||||||
| Subjects: | T Technology > TS Manufactures | |||||||||
| Divisions: | 03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi |
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| Depositing User: | Mr Prima Dhany | |||||||||
| Date Deposited: | 15 Nov 2022 10:22 | |||||||||
| Last Modified: | 15 Nov 2022 10:22 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/17263 |
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